US9314150B2 - System and method for detecting tooth cracks via surface contour imaging - Google Patents
System and method for detecting tooth cracks via surface contour imaging Download PDFInfo
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- US9314150B2 US9314150B2 US13/194,191 US201113194191A US9314150B2 US 9314150 B2 US9314150 B2 US 9314150B2 US 201113194191 A US201113194191 A US 201113194191A US 9314150 B2 US9314150 B2 US 9314150B2
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Abstract
Description
-
- (i) Same polarization transmission axis as
polarizer 14. In this “co-polarization” position,detector 30 obtains the specular light reflected from the surface oftooth 20, and most of the light scattered and reflected from the superficial layer of enamel surface oftooth 20, as well as some of the light scattered back from sub-surface portions of the tooth. The co-polarization orientation of the analyzer 28 axis is shown inFIG. 2A . Parallel or co-polarization provides improved contrast over other configurations. - (ii) Orthogonal polarization transmission axis relative to polarizer 14. Using the orthogonal polarization, or cross-polarization, helps to reduce the specular component from the tooth surface and obtain more of the scattered light from inner portions of the tooth. The cross-polarization orientation of the analyzer 28 axis is shown in
FIG. 2B .
- (i) Same polarization transmission axis as
[x t+1,y t+1,1]T=Φt+1(x t ,y t)[x t ,y t,1]T (10-1)
and a translation vector
where ε is the proportion of erroneous data, (1−ε)s is the probability of picking a non erroneous data. Therefore (1−(1−ε)s)N is the probability of failure for all trials. Denote a data count by c. The parameter N can be chosen adaptively with the following algorithm.
Set N ← ∞ and c ← 0 | ||
White N > c repeat | ||
1. randomly select s data points and instantiate | ||
the model from this subset | ||
2. Determine the set of inliers as the data lying | ||
within a distance threshold t of the model | ||
3. compute the proportion ε of outliers | ||
4. Set N ← min(N,K(ε,p)) | ||
5. increment c by 1 | ||
Terminate | ||
The pixel coordinate pl
and the centers ol
With the same formulation, another integral computation can be made at an angle φ=φ+90° resulting in an integral curve S(φ). Peak-to-peak values are computed for these two curves. p(φ) for s(φ), p(φ) for s(φ). The ratio =p(φ)/p(φ) is the feature to be used in step 154 to detect linear structures. If the ratio, , exceeds a predefined threshold, a crack or a fracture is reported.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/194,191 US9314150B2 (en) | 2009-04-16 | 2011-07-29 | System and method for detecting tooth cracks via surface contour imaging |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/424,562 US20100268069A1 (en) | 2009-04-16 | 2009-04-16 | Dental surface imaging using polarized fringe projection |
US13/194,191 US9314150B2 (en) | 2009-04-16 | 2011-07-29 | System and method for detecting tooth cracks via surface contour imaging |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/424,562 Continuation-In-Part US20100268069A1 (en) | 2009-04-16 | 2009-04-16 | Dental surface imaging using polarized fringe projection |
Publications (2)
Publication Number | Publication Date |
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US20110287387A1 US20110287387A1 (en) | 2011-11-24 |
US9314150B2 true US9314150B2 (en) | 2016-04-19 |
Family
ID=42270206
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US12/424,562 Abandoned US20100268069A1 (en) | 2009-04-16 | 2009-04-16 | Dental surface imaging using polarized fringe projection |
US13/194,191 Active 2029-12-06 US9314150B2 (en) | 2009-04-16 | 2011-07-29 | System and method for detecting tooth cracks via surface contour imaging |
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Application Number | Title | Priority Date | Filing Date |
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US12/424,562 Abandoned US20100268069A1 (en) | 2009-04-16 | 2009-04-16 | Dental surface imaging using polarized fringe projection |
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US (2) | US20100268069A1 (en) |
EP (1) | EP2241247B1 (en) |
JP (1) | JP5296728B2 (en) |
KR (1) | KR20100114843A (en) |
CN (1) | CN101862182B (en) |
ES (1) | ES2386115T3 (en) |
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JP5296728B2 (en) | 2013-09-25 |
US20110287387A1 (en) | 2011-11-24 |
EP2241247B1 (en) | 2012-05-30 |
EP2241247A1 (en) | 2010-10-20 |
KR20100114843A (en) | 2010-10-26 |
ES2386115T3 (en) | 2012-08-09 |
US20100268069A1 (en) | 2010-10-21 |
CN101862182B (en) | 2013-02-06 |
CN101862182A (en) | 2010-10-20 |
JP2010246899A (en) | 2010-11-04 |
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